Improvement in machines for grinding saw-teeth



tiu Suns JOHN-L,l OTIS, vOF LEEDS, MASSACHUSETTS.

Letters Patent No. 112,838, dated March 21, 1871.

IMPRovEMENr IN MACHINES Fon GRINDING SAW-Tecra.

The Schedule 'referred to h1 these Letters Patent and making partei the saine.

To all whom', it may concern Be it known that JOHN L. 0'1I`S, of Leeds, in the county of Hampshire ande-State of' Massachusetts, have invented certain new and useful Improvements .in Machines or Machinery for using'Einery-Wheels for Grinding Saws or other articles; andl I do hereby declare the following to be a full, clear, and exact description of' the same, reference being had to the laccompanying drawing making a part of this specification, in which- Figure l represents a perspective view of the ma chine.

Figure 2 represents a section through the emery wheel, its shaft, and journal-bearings, and the stand on whichit rests.

Figure 3 represents a section through the mechanism fcr holding, controlling, and gauging the saw.

Figure 4 represents in `perspective thev gauge and its'snpport for accurately spacing and iling the sawteeth'.

Similar letters of reference where they occur inthe separate figuresl denote like'parts in the drawing.

My invention relates, first, to the 'manner-'of hanging and shielding the emerywheel shaft fromthe grit and dust which so wears or cuts out its bearings.

It further relates to the arrangement for'holding, controlling, and feeding a saw or saw-plate upto the .emery-wheel.

It further consists in the construction and `opera-V tion of a gauge for spacing the saw-teeth and'gauging their depth.

To enahle'others skiliedin'the art to make and use my invention, I will proceed to describe the same with reference to the drawing.

A-represents a stand, in and on which the shaftB of the emery-wheel C is supported, shielded, and turns.

The eiuery-wheel C is arranged at one end of the shaft B, and the pulley D, by which it is driven, may be arranged at the opposite end of said shaft;

The horizontal portion A of the standiscast' on or with thevertical portion A,\and is hollow or concave, so that it may receive more or less of the shaft B.

Over this horizontal portion Aa cap, E, fits, which is also hollow or convex, so as totalie inv a portion of by screw and flanges', as at a b, a similar fastening heing on the other side, but not'showniu the drawing. The bearinglbox or shaft-support and cap'A and E are made with a chamber or recess, c, at or near ea'ch of their ends, in which runs an annular projection, e, or anch, attached tothe shaft B, said projection not quite filling the chamber c.

The outer ledger, of this chamber c is made to fit theshaft, or a collar, m, on it. As'the recess or chamber c cuts ol' the capillary attraction between the lnhricator in said chamber and the emeryfdust, the latter cannot be drawn into the bearings after being saturated 4with the oil. .The dust is prevented from entering the bearing through the oil-hole by the use ofthe.

common brass oil-cup or a well-fitted cap, and vthus the shaft-bearings are protected from the only openings through which the emery-dust could find its way to them, and they are thus prevented from beingv ground or worn away and from being clogged by said dust.

The mechanism for holding and guiding saws while being ground, gummed, or sharpened by emery-wheels is as follows:

To an arm, F, onthe stand A, there is connected, by a screw, d', and vnut f, a horizontal rest or support,- G.' The head of the screw d works in annndercut slot, g, in the rest G, and its shank passes through a slot, h, in the arm F, so that the rest or support Gr may have two adjustments on thearm F, viz., to and from the stand, and in the line of its own length.

In a hub or enlargement j on the end of the rest G rests, and is supported and adjusted, a shaft or jonr nal, lo, which carries upon its upper end a supportingarm, H, upon ways n n, on which arm H the carriage I, to whichA the saw J'is clamped, may freely slide or he moved,`

An adjustable stop, o, is arranged upon the arm-H, against which the carriage l cornes when moved toward the emery-wheel c, and which regulates and defines the exact distance that. the wheel may out into the saw or saw-plate J.

On the end of the supporting-arm H, next to' the emery-whecl, there is an upright projection, i, to. which an adjustable saw-plate-supporter, p, is attached hy a set-screw, g, the purpose of this supporter being to hold the saw or plate against the action ofthe einerywheel. And. upon this saw-supporter p there is a slottedl gauge, fr, having an upright arm, s, upon it, and held, when adjusted, tc said supporter by a setscrew t. rlh'e purpose of this gauge is that its arm s may take into the gullet or throat of the saw-tooth just previously out, ground, or sharpened, and so space and'regniate the plate for the next tooth, and thus attain perfect regularity in the teeth of the saw. said shaft B, and the cap is fastened to the portion A.

The saw-plate holder or clamp is 'composed of two parts, u and c, and are held to the carriage I, or an arm, w, thereon, oy a nut, x, running onto a shank, y, l

made on a yoke or ring, z, that holds the clamp and allows it' to be adjusted therein, and when adjusted the clamp and saw may he turned around to bring a new tooth to the emery-wheel, they turning in said yoke or ring c.

In the 'under portion u of the clamp there is a re cess, l, from and through the center of .which rises a screw-shaft, 2, on which a conical nut, 3, can he raised or lowered, atple'asure,lout of or into the recess. The

object of this conical nutfis thatpit 4may 'receive and snugly it into the various-sized openings in the centers of saw-plates, and so hold the saws firmly and truly in the clamp. The nut is raised or lowered until a portion of it that is'diametrioally the 'same as the opening in the saw is on a level with the top portion of the clamp u. The saw isrthen slipped over it; the top portion fu, which is hollow underneath, also, to receivethe cone 3, is laid onto it, and the. nnt=4 run down on the screw-shaft 2.` In this condition the saw is ready to be run up to the emery-wheel.

Any required Vadj ustment may be attained by the devices and, mechanism hereindescribed. l

The operation is so obvious that it need not be particularly described, inasmuch as the drawing is very distinct and clear.

Having thus fully described my invention,

iVhat I claim as new, and desire to secure by Letters Patent, is-

1. In combination with a stand for carryingr and supporting an emery-wheel shaft, the tubular bearing, composed of the armsA'` and cap or cover E, and their recesses c, projections e, and` flanges 'c'. as and for the purpose described and represented.

y 2. In combination with the stand,'tl1e arrangement of the arms F, G, H, and p, and their respective adjustments, as and for` the purpose described.

3. In combination with the saw-plate clamp and its carriage, thevring or yoke z, for supporting the clainp in the'carriage and allow it to be turned with the saw, substantially as described.

JOHN L. OTIS.

Witnesses i' STEPHEN B. FULLER, P. A. Oris. 

